The invention discloses a data mining method based on extraction of Web numerical value tables. The method is based on domain knowledge base, adopts generation of numerical value knowledge element base as a basic target, and mainly comprises construction of domain knowledge base basic set, positioning of Web numerical value tables, recognition of table structure, integration of table content, semantic representation of extract result, data retrieval, automatic learning of domain knowledge and data mining processing and the like. The invention is based on the method of extraction of Web numerical value tables in specific domain, can carry out extraction to data, information and knowledge included in numerical value tables in Web pages, converts semi-structured data into structured data and provides services of data retrieval, data mining analysis and the like. The data mining method can completely and accurately extract valuable numerical value knowledge in large amount of Web numerical tables dispersed on Web and meets the requirements of data query and data analysis of a user.